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virtio: disable ioeventfd for record/replay

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virtio devices support separate iothreads waiting for
events from file descriptors. These are asynchronous
events that can't be recorded and replayed, therefore
this patch disables ioeventfd for all devices when
record or replay is enabled.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgalyuk@ispras.ru>
Message-Id: <162125678869.1252810.4317416444097392406.stgit@pasha-ThinkPad-X280>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Pavel Dovgalyuk 2021-05-17 16:06:28 +03:00 • committed by Michael S. Tsirkin
parent 9c2647f750
commit 3909c07945
3 changed files with 18 additions and 0 deletions
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6
hw/virtio/virtio-mmio.c
View file

@ -29,6 +29,7 @@
#include "qemu/host-utils.h"
#include "qemu/module.h"
#include "sysemu/kvm.h"
#include "sysemu/replay.h"
#include "hw/virtio/virtio-mmio.h"
#include "qemu/error-report.h"
#include "qemu/log.h"
@ -740,6 +741,11 @@ static void virtio_mmio_realizefn(DeviceState *d, Error **errp)
proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD;
}
/* fd-based ioevents can't be synchronized in record/replay */
if (replay_mode != REPLAY_MODE_NONE) {
proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD;
}
if (proxy->legacy) {
memory_region_init_io(&proxy->iomem, OBJECT(d),
&virtio_legacy_mem_ops, proxy,